Merge pull request #268 from HubSpot/hs_staging

hs_staging changes
Merge pull request #272 from HubSpot/hs_staging

guice client changes
upgrade vagrant box to mesos 0.20.1 + docker preinstalled, and include vm for rebuilding base image
Merge branch 'master' of github.com:HubSpot/Singularity
If no taskStatus has been delivered, add fake one

- Handles the case where a task is lost without even delivering
TASK_STARTING and that TASK_LOST message is also never delivered
test for reconciliation + fix
Merge pull request #274 from HubSpot/add_fake_task_status_for_reconciliation

If no taskStatus has been delivered, add fake one